#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n, q;
    cin >> n >> q;
    vector<int> arr(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> arr[i];
    }
    vector<long long> dp(n + 1);
    for (int i = 1; i <= n; i++) dp[i] = dp[i - 1] + arr[i];
    int l = 0, r = 0;
    while (q--) {
        cin >> l >> r;
        cout << dp[r] - dp[l - 1] << endl;
    }
    return 0;
}